It's an EX-2. Thicker struts (and one more in back) than most of their racks.
Designed to take some serious weight. Good luck finding one - they are a rare breed. I got mine at a local swap meet. The only one I saw on Ebay was priced over $200! The EX-1 is more common, but the issue I have with that version is the width of the rear struts is not wide enough for fat tires or fenders in some cases. If you have a local co-op or used bike shop, check there first. Sometimes they have old racks that you can pick up cheap. And those strut bolt thingies are pricey too - I just happened to have a couple laying around. What kind of bike does she have? Might help to see what you're dealing with. Feel free to PM me with pics if you like.
Necessity is the mother in invention - you'll find something that will work.
Marty